A couple of things: Yeshivas curricula (plural for curriculum) are guided by their Rosh(ei) Yeshiva.
Second, trigonometry in particular is used in a couple of Mesechtos in Shas and is elaborated on in Tosfos. Day-to-day things like Sh’kia use trig. If the mods don’t allow posting email addresses, how about posting your trig or other math questions and some of us math people will gladly answer. I aced Math 3 and did very well in PreCal Cal 1 & 2 and other advanced math classes.
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